Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
flux-cdn.com/client/00046/itmedia_01591.min.js	300.0 s	81.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	1200.0 s	44.8 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cdn.id5-sync.com/api/1.0/esp.js	3600.0 s	34.7 KiB
pagead2.googlesyndication.com/pagead/js/rum.js?fcd=true	3600.0 s	25.1 KiB
cs.nakanohito.jp/b3/bi.js	10800.0 s	20.7 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
connectid.analytics.yahoo.com/connectId-gpt.js	3600.0 s	9.0 KiB
static.criteo.net/js/ld/publishertag.ids.js	86400.0 s	14.8 KiB
tags.crwdcntrl.net/lt/c/16589/sync.min.js	86400.0 s	13.1 KiB
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	14400.0 s	7.1 KiB
cse.google.com/cse.js?cx=000492183644671384608:6dff3odaltq	0.0 ms	4.0 KiB
invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js	0.0 ms	2.9 KiB
/v1/000GPFga3O1vbNuzhU49ZtSbm2Nw63YhthzzYz6tSDK5C12A5XHD8...	86400.0 s	6.3 KiB
/v1/001oaYGiQdLTaRVFjbIRCn1JsqVkwpvEynZyJIMyNU3yPFOek307F...	86400.0 s	5.7 KiB
/v1/000L9OoXkxSazCUmKf4OLPmIYqZhD0Qk5ojOKepjUNEmaVbbhEgqL...	86400.0 s	5.6 KiB
/v1/000L9OoXkxSazCUmKf4OLPmIYqZhD0Qk5oj5ZY5IMSVgmK2Ta8aj1...	86400.0 s	4.8 KiB
/v1/000jJf2zR0jt9gJ3qcTPTjuD2mXxbZnGq34dCGcvYL8UrW3LxbNGn...	86400.0 s	4.1 KiB
pagead2.googlesyndication.com/pagead/js/r20260421/r20110914/abg_lite.js	1209600.0 s	10.5 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
/pagead/js/r20260420/r20110914/client/qs_click_protection...	1209600.0 s	8.5 KiB
/v1/002enbgBanXw2q8vNuPEvMN7fIQ8SL03ow3wfWFFwteCxaNV2r047...	86400.0 s	1.9 KiB
/pagead/js/r20260421/r20110914/elements/html/omrhp.js	1209600.0 s	4.7 KiB
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo9cnxz171nw8tpo&sid=...	0.0 ms	412 B
tr.api.itmedia.co.jp/cc/v1.js	0.0 ms	350 B
cx.api.itmedia.co.jp/v1.js	0.0 ms	241 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.6 KiB
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.2 KiB
/aon.png?customerId=b18a644a0e17bc7f&uid=&cxckp=cx%3A2t19...	3600.0 s	146 B
cdn.jsdelivr.net/gh/prebid/shared-id/pubcid.js/docs/pubcid.min.js	604800.0 s	973 B
/tr/?id=185005748502834&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/js/r20260420/r20110914/client/qs_click_protection...	1209600.0 s	0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	0 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.2 source:map[column:1707 line:6 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/exm=kernel_loader,loader_js_executable,web_iab_tcf_v2_signal_executable/ed=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=ad_blocking_detection_executable urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:13.731 source:map[column:237248 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:2.282 source:map[column:102033 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:52.378 source:map[column:241855 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:1.429 source:map[type:text value:[unattributed]]] map[reflowTime:0.243 source:map[column:143046 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:0.144 source:map[column:71625 line:5 type:source-location url:https://cdn.cxense.com/cx.js urlProvider:network]] map[reflowTime:0.316 source:map[column:1628 line:5 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/exm=kernel_loader,loader_js_executable,web_iab_tcf_v2_signal_executable/ed=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=ad_blocking_detection_executable urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
tr.api.itmedia.co.jp/cc/v1.js	350 B	292 ms
www.itmedia.co.jp/js/base_v2.js?202501291050	9.2 KiB	107 ms
fc.itmedia.co.jp/fpcookie?site_id=itm_	1001 B	275 ms
cx.api.itmedia.co.jp/v1.js	241 B	274 ms
www.itmedia.co.jp/js/gamServerEnvironment.js?date=202107151140	356 B
www.itmedia.co.jp/js/lib/cx_v2.js?202507231610	10.2 KiB
www.itmedia.co.jp/css/top/base.css?202511251430	2.3 KiB
www.itmedia.co.jp/js/spv/movePC2SP.js?date=250916104008	4.7 KiB
www.itmedia.co.jp/css/gnavi.css?date=202601281531	4.0 KiB
www.itmedia.co.jp/css/base.css?202509161104	5.0 KiB
cdn.cxense.com/cx.js	38.1 KiB	167 ms

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
static.criteo.net/design/dt/59b95d61b36143bab1e1f6adc740526b_adihausbold.woff	10 ms
static.criteo.net/design/dt/df5b439f06e34b19bdeac1f8701aba0d_adihausregular.woff	10 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
body > div#google_image_div > a#aw0 > img.img_ad `body > div#google_image_div > a#aw0 > img.img_ad`	tpc.googlesyndication.com/simgad/14211902422675294702	137.2 KiB	97.7 KiB
・OpenAI、“視覚的思考パートナー”「ChatGPT Images 2.0」発表　Web検索結果を反映する画像生成も可能に `div.colBoxIndex > div.colBoxUlist > ul > li`	tpc.googlesyndication.com/simgad/8942407595710879420?	49.2 KiB	48.4 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	tpc.googlesyndication.com/simgad/12555551469554340024?	38.8 KiB	38.0 KiB
・“Mythos級”AI到来に備え、自民党が日本版「Project Glasswing」組成を検討 `div.colBoxIndex > div.colBoxUlist > ul > li`	tpc.googlesyndication.com/simgad/4846201149167440866?	22.2 KiB	21.4 KiB
メディア一覧 \| 公式SNS \| 広告案内 \| お問い合わせ \| プライバシーポリシー \| RSS \| 運営会社 \| 採用情報 \| 推奨環境 `div#globalFooter > div#globalFooterCorp > div#globalFooterCorpIn > p#globalFooterCorpLink`	/simgad/7370903963884609559?sqp=uqWu0g0ICPoBEKwCQGQ&rs=AO...	27.1 KiB	14.9 KiB
アイティメディアのタイアップコンテンツページへのリンク `div.colBoxIndex > div.colBoxBanner > a > img`	image.itmedia.co.jp/images0509/tot_banner_1_1703141393.jpg	7.0 KiB	5.1 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news022.jpg	6.4 KiB	4.6 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/news/articles/2604/05/top_news003.jpg	6.2 KiB	4.5 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 403 ms

URL	Time Spent
itmedia.co.jp/	403 ms
www.itmedia.co.jp/	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	1.8 s	1.6 s	19 ms
Unattributable	844 ms	293 ms	0.0 ms
fundingchoicesmessages.google.com/i/43042345?ers=3	732 ms	713 ms	7.1 ms
cdn.cxense.com/cx.js	544 ms	90 ms	9.4 ms
www.itmedia.co.jp/	378 ms	16 ms	5.1 ms
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	236 ms	201 ms	26 ms
/pagead/managed/js/activeview/current/ufs_web_display.js	116 ms	103 ms	8.1 ms
www.googletagmanager.com/gtag/js?id=AW-1032582312	103 ms	87 ms	15 ms
www.googletagmanager.com/gtag/js?id=AW-10976778865	89 ms	74 ms	14 ms
www.googletagmanager.com/gtag/js?id=AW-578569290	88 ms	63 ms	14 ms
flux-cdn.com/client/00046/itmedia_01591.min.js	86 ms	53 ms	26 ms
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	84 ms	68 ms	15 ms
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	58 ms	36 ms	5.8 ms
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	58 ms	39 ms	6.5 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	3.8 s
Other	1.1 s
Style & Layout	355 ms
Script Parsing & Compilation	321 ms
Garbage Collection	103 ms
Rendering	64 ms
Parse HTML & CSS	44 ms

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.8 KiB

URL	Transfer Size	Est Savings
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+ja.css	9.7 KiB	2.8 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.5 KiB

URL	Transfer Size	Est Savings
www.itmedia.co.jp/js/lib/cx_v2.js?202507231610	10.0 KiB	2.5 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 1.1 MiB

URL	Transfer Size	Est Savings
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	599.8 KiB	281.0 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64h1	143.5 KiB	106.0 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64h1	146.5 KiB	105.1 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64h1	136.5 KiB	102.7 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	152.1 KiB	63.3 KiB
flux-cdn.com/client/00046/itmedia_01591.min.js	81.5 KiB	58.1 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290	136.5 KiB	55.8 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865	143.6 KiB	55.6 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312	146.6 KiB	54.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	188.1 KiB	53.2 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?u...	98.8 KiB	49.5 KiB
fundingchoicesmessages.google.com/i/43042345?ers=3	68.5 KiB	36.3 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	34.2 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	33.4 KiB
cdn.id5-sync.com/api/1.0/esp.js	34.4 KiB	30.7 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.3 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	599.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	188.3 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	152.2 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312	146.9 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64h1	146.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865	143.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64h1	143.5 KiB
tpc.googlesyndication.com/simgad/14211902422675294702	137.6 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290	136.6 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64h1	136.5 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Reduce unused CSS

●User Timing marks and measures 26 user timings

●Avoid long main-thread tasks 17 long tasks found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 290 ms

●Server Backend Latencies 410 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 140 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
AI＋ `div.colBoxIndex > div.colBoxTitle > span.colBoxInfo > a`

These are opportunities to improve the legibility of your content.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html#masterChannel-top `html#masterChannel-top`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○Buttons have an accessible name

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

Browser Compatibility

Specifying a doctype prevents the browser from switching to quirks-mode. Learn more about the doctype declaration.

Why this matters

Performance issues directly impact user engagement and conversion rates.

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769
SharedStorage	/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234
Topics	invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js line 5, col 1847

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`